Apparatus for making plastic polygonal-shaped valve-packings.



(No Model.)

M. E. LYNCH. APPARATUS FOR MAKING PLASTIC POLYGONAL SHAPED VALVEPACKINGS.

(Application filed Apr. 5. 1900.)

Patented Dec. ll, I900.

lJNrrE rATEs i FFICE.

MICHAEL E. LYNCH, 0F ELIZABETH, NEW JERSEY.

APPARATUS FOR MAKING PLASTIC POLYGONAL-SHAPED VALVE-PACKINGS.

SPECIFICATION forming part of Letters Patent N 0. 663,608, datedDecember 11, 1900.

Application filed April 6, 1900.

To all whom it may concern:

Be it known that I, MICHAEL E. LYNCH, a citizen of the United States ofAmerica, and a resident of Elizabeth, in the county of Union and Stateof New Jersey, have invented certain new and useful Improvements inApparatus for Making Plastic Polygonal-Shaped Valve-Packings, of whichthe following is a full, clear, and exact description.

This invention relates to an apparatus for making polygonal-shaped disksor packings for use in steam-valves and other valves.

In an application for Letters Patent of the United States filed by meJanuary 23, 1900, Serial No. 2,503, I have illustrated a valvecomprising therein an improved disk-holder in which are appliedoctagonal packing-disks such as it is the purpose of this invention toproduce.

The invention embodies a die having in one member thereof a die-cavityformed with opposite V-shaped projections the apexes of which areseparated, and in which cavity may be received a bar or strip of theplastic material from which the mold-strip of disks to be made isentered, said bar or strip having a thickness or height greater than thedepth of the molded cavity and having the cross-sectional bulk such thatwhen the upper or coacting flat-faced member of the die is pressedagainst the recessed member the material which has become susceptible ofbeing molded by the application of heat transmitted thereto through themembers of the mold will be compressed and displaced, wideningtransversely to fill the remainder of the spaces lying between theV-shaped portions of the die-walls at either side of the die-cavity. Bythe employment of this mold a strip is produced from the plastic packingmaterial which may be any suitable compound of india-rubber orgntta-percha, which strip has in the opposite edges thereof c0incidingangular or V-shaped notches or recesses. By severing portions of thestrip on transverse lines extending from the apex of the one notch tothat of the opposite notch the octagonal plinths, or disks, as they aretermed among valve-makers, are produced and all without any waste of theplastic material.

The means for carrying out the invention Serial No. 11,841. (No model.)

one of whichis a strip of the plastic material from which a strip fordisks is to be produced and showing also the upper die member separatedfrom the lower one. Fig. 2 is a crosssectional view on line 2 2, Fig. 1.Fig. 3 is a perspective view of a portion of one of the molded stripsfrom which a plurality of disks may be produced by simply severing onthe dotted lines. Fig. 4 is a perspective view of one of the disksunderstood as severed from the strip such as seen in Fig. 3.

Similar characters of reference indicate corresponding parts in all ofthe views.

In the drawings, A represents the lower or female die, and B representsthe upper die. The lower die has a die-cavityO therein, the depth ofwhich corresponds to the thickness of one of the packing-disks to beproduced. The die-cavity has the opposite vertical walls a a, which areparallel with each other, and at suitable intervals theinwardly-convergent or V-shaped walls of, the apexes of those at oneside being exactly opposite the apexes at the other side. The mold maybe as long as the length of the strip desired to be produced and has atthe ends of the die-cavity the walls a which are right angular to theones a.

While for the purposes of understanding the present invention it is onlynecessary to particularly describe a die having a single die-cavity inwhich may be molded a strip having at its opposite edges several of theV recesses or notches, in practice I make the female die with a numberof rows of the diecavities and each of such length as to produce a stripfrom which to make a dozen, or, perhaps, many more of the disks.

Now into the mold-cavity is placed a bar or strip 00 of a plasticmaterial, such as employed in the composition of valve-packing disks,which bar or strip is of a width no greater than the distance betweenthe oppo-. site apexes of the convergent walls a a but which is of athickness so much greater than the depth of the mold-cavity as to give across-sectional bulk in the strip equal to the capacity of the entiremold-cavity, including not only the space in which the strip is at firstset, but also the spaces at either side thereof between the severalconvergent walls G2 a The dies are Worked in a heated condition, and thestrip 00, having by contact with the die become softened, may be readilycompressed and caused to entirely fill the diecavity, asuitably-powerful press being employed for forcing the separable membersof the die, the one, B, closely and solidly against the top of theother, A. The plastic material having been compressed and molded intothe form of the strip, such as seen in Fig. 3, requires only, then, forthe production of the octagonal disks that it be severed on the lines 1y, and it will be apparent from the foregoing that there is-due carehaving been taken that the bulk of the strip m is just sufficient tofill the die-cavity-no Waste material, for the entire strip becomesutilized when the same is cut up in the packing-disks.

Having thus described my invention, what I claim, and desire to secureby Letters Pat out, is-

Adie for the production of an edge-notched strip to be divided withoutwaste into polygonal packings consisting of a female die mem' ber Ahaving a die-cavity therein formed with opposite walls a, aperpendicular to its bottom and having at intervals the convergent orV-arranged walls a a the apexes of a series at one side being oppositethe apexes of a similar series at the other side, and a flatfaced,coacting die member B, all whereby a straight bar or strip of thematerial to be molded having a width no greater than the distancebetween the aforesaid apexes of the opposite convergent die-walls, buthaving a thickness greater than the depth of the diecavity, may beplaced in, compressed and molded in the die to completely fill saidcavity and produce the described edge-notched form of strip,substantially as and for the purpose set forth.

Signed by me at Elizabeth, New Jersey, this 2d day of April, 1900.

- MICHAEL E. LYNCH. Witnesses:

P. J. RYAN, E. WRIGHT.

